LDP Specification
draft-ijln-mpls-rfc5036bis-00

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Network Working Group                                            X. Chen
Internet-Draft                                              L. Andersson
Intended status: Standards Track                     Huawei Technologies
Expires: August 18, 2016                                      N. Leymann
                                                        Deutsche Telekom
                                                                I. Minei
                                                                  Google
                                                       February 15, 2016

                           LDP Specification
                   draft-ijln-mpls-rfc5036bis-00.txt

Abstract

   The architecture for Multiprotocol Label Switching (MPLS) is
   described in RFC 3031.  A fundamental concept in MPLS is that two
   Label Switching Routers (LSRs) must agree on the meaning of the
   labels used to forward traffic between and through them.  This common
   understanding is achieved by using a set of procedures, called a
   label distribution protocol, by which one LSR informs another of
   label bindings it has made.  This document defines a set of such
   procedures called LDP (for Label Distribution Protocol) by which LSRs
   distribute labels to support MPLS forwarding along normally routed
   paths.

Status of This Memo

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Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Chen, et al.             Expires August 18, 2016                [Page 1]
Internet-Draft              LDP Specification              February 2016

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Table of Contents

   1.  Editors notes - this section will be  removed before
       publication . . . . . . . . . . . . . . . . . . . . . . . . .   5
     1.1.  Scope of RFC5036bis work  . . . . . . . . . . . . . . . .   5
     1.2.  ToDo  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   2.  LDP Overview  . . . . . . . . . . . . . . . . . . . . . . . .   6
     2.1.  LDP Peers . . . . . . . . . . . . . . . . . . . . . . . .   7
     2.2.  LDP Message Exchange  . . . . . . . . . . . . . . . . . .   8
     2.3.  LDP Message Structure . . . . . . . . . . . . . . . . . .   8
     2.4.  LDP Error Handling  . . . . . . . . . . . . . . . . . . .   8
     2.5.  LDP Extensibility and Future Compatibility  . . . . . . .   9
     2.6.  Specification Language  . . . . . . . . . . . . . . . . .   9
   3.  LDP Operation . . . . . . . . . . . . . . . . . . . . . . . .   9
     3.1.  FECs  . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     3.2.  Label Spaces, Identifiers, Sessions, and Transport  . . .  10
       3.2.1.  Label Spaces  . . . . . . . . . . . . . . . . . . . .  11
       3.2.2.  LDP Identifiers . . . . . . . . . . . . . . . . . . .  11
       3.2.3.  LDP Sessions  . . . . . . . . . . . . . . . . . . . .  12
       3.2.4.  LDP Transport . . . . . . . . . . . . . . . . . . . .  12
     3.3.  LDP Sessions between Non-Directly Connected LSRs  . . . .  12
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